[lupire]

On mobile Firefox the zoom is shaky and halfway through the game it zoomed in and didn't zoom back out so I couldn't see the whole board for the rest of the game.

The promotion menu disappears so I couldn't promote.

It also draws wrong if I preemove a recapture and then change to a new move. More generally, it allows infinite premoves and crashes.

Also, the clock is distracting, especially because the proportional font keeps moving the digits. Besides that, pretty good. And the colors are mushy and low contrast.